抑制飞控系统极限环的非线性方法

 抑制飞控系统极限环振荡是设计数字电传系统时需要解决的重要问题。针对飞控系统中常见的不确定非线性,提出仿线性元件的思想,以实现所期望的系统稳定裕度,从而克服非线性所造成的影响；针对确定的非线性,提出了非时变非线性可补性的概念,并应用于控制器中,实现非线性的补偿。将两种方案用于飞控系统中,仿真结果表明,对抑制系统的极限环是有效的。

NONLINEAR METHODS OF DEPRESSING LIMIT CYCLES OF FLIGHT CONTROL SYSTEM

he problem of how to depress the limit cycle oscillation of flight control system must be solved in the design of DFBW system. For uncertain nonlinear factors of flight control system, a new idea of the imitative linear unit is put forward to realize the desired stability mar-gin of the system and overcome the effects of nonlinearities. On the other hand, to the known nonlinear factors,the concept of mendability is discussed and used in the controller to compen-sate for the nonlinearities.Both methods used in flight control system are valid to depress the limit cycles as a result of the simulation.